feat: Add appearance customization screen with background blur options

- Introduced `BackgroundBlurOption` data class and `BackgroundBlurPresets` object for managing background blur options.
- Created `AppearanceScreen` composable for selecting background colors and gradients, including a live preview of the selected option.
- Updated `OtherProfileScreen` and `ProfileScreen` to accept and utilize `backgroundBlurColorId` for consistent background blur across profiles.
- Enhanced `CollapsingOtherProfileHeader` and `CollapsingProfileHeader` to apply selected background blur options.

app/src/main/java/com/rosetta/messenger/ui/chats/ChatsListScreen.kt

@@ -49,6 +49,7 @@ import com.rosetta.messenger.ui.components.AppleEmojiText
 import com.rosetta.messenger.ui.components.AvatarImage
 import com.rosetta.messenger.ui.components.BlurredAvatarBackground
 import com.rosetta.messenger.ui.components.VerifiedBadge
+import com.rosetta.messenger.ui.settings.BackgroundBlurPresets
 import com.rosetta.messenger.ui.onboarding.PrimaryBlue
 import java.text.SimpleDateFormat
 import java.util.*
@@ -167,6 +168,7 @@ fun ChatsListScreen(
         onSearchClick: () -> Unit,
         onNewChat: () -> Unit,
         onUserSelect: (com.rosetta.messenger.network.SearchUser) -> Unit = {},
+        backgroundBlurColorId: String = "avatar",
         chatsViewModel: ChatsListViewModel = androidx.lifecycle.viewmodel.compose.viewModel(),
         avatarRepository: com.rosetta.messenger.repository.AvatarRepository? = null,
         onLogout: () -> Unit
@@ -453,7 +455,8 @@ android.util.Log.d("ChatsListScreen", "✅ Total LaunchedEffect: ${System.curren
                                                                 avatarRepository = avatarRepository,
                                                                 fallbackColor = headerColor,
                                                                 blurRadius = 40f,
-                                                                alpha = 0.6f
+                                                                alpha = 0.6f,
+                                                                overlayColors = BackgroundBlurPresets.getOverlayColors(backgroundBlurColorId)
                                                         )
                                                         
                                                         // Content поверх фона